linux-kernel - Re: [PATCH] USB: serial: simple: add sierra wireless xm1210 gnss receiver

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Message-ID: <CAMRMzCAUw01N_WmriwGV7rJu9D-rwF8xHuwySZpsw7eQfb0OMg@mail.gmail.com>
Date:   Thu, 18 Nov 2021 11:09:25 -0500
From:   Marc Ferland <ferlandm@...tus.ca>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     johan@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: simple: add sierra wireless xm1210 gnss receiver

On Wed, Nov 17, 2021 at 8:36 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Wed, Oct 27, 2021 at 04:02:23PM -0400, ferlandm@...tus.ca wrote:
> > From: Marc Ferland <ferlandm@...tus.ca>
> >
> > Add device id for the Sierra Wireless XM1210 Multi-GNSS module.
> >
> > https://www.sierrawireless.com/iot-solutions/products/xm1210/
> >
> > $ lsusb -vd 1199:b000
> >
> > Bus 002 Device 003: ID 1199:b000 Sierra Wireless, Inc. Sierra Wireless_GNSS
>
> Why doesn't this device work with the qcserial.c driver instead?  Have
> you tried that?
>

I just tried adding the USB_ID to the qcserial driver and it fails
with -ENODEV. Looking at the code it seems qcserial only supports the
USB_CLASS_VENDOR_SPEC interface class and this device returns an
interface class value of 0 (reserved?):

$ lsusb -vd 1199:b000 | grep bInterfaceClass
      bInterfaceClass         0

Thanks,

Marc